前言:这是CAN/CSA-C22的第三版。2第60079-15号，爆炸性环境-第15部分:防护类型为“n”的设备防护，这是采用相同名称的IEC（国际电工委员会）标准60079-15（第五版，2017-12）的加拿大偏差。它取代了2016年发布的前一版CAN/CSA-C22。2号60079-15（采用IEC 60079-15-2010）。这是CSA集团根据《加拿大电气规范》第二部分发布的一系列标准之一。为简洁起见，本标准通篇称为“CAN/CSA-C22.2编号60079-15”。本标准拟与CAN/CSA-C22结合使用。2号60079-0，爆炸性环境-第0部分:设备-一般要求。本版本的变更包括对IEC标准第五版的变更:a）封闭式断路器“nC”现在被指定为“dc”，要求见CAN/CSA- C22。2号60079-1。b） 保护类型“nA”现在被指定为保护类型“ec”，对“ec”设备的要求位于CAN/CSA-C22中。2号60079-7。c） 规定了非燃烧性成分样品制备的试验时间。d） 增加了密封件和垫圈的额外文件要求。e） 由于装有风扇的外壳内的压力可能会受到风扇运行的影响，现在规定在风扇运行且静止的情况下进行限制呼吸试验。f） CAN/CSA-C22的限制。增加了第60079-15号第一版。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。范围:IEC 60079的本部分规定了保护类型为“n”的II类电气设备的结构、测试和标记要求，包括:； 用于爆炸性气体环境的密封装置“nC”、密封装置“nC”、非易燃部件“nC”和限制呼吸外壳“nR”。IEC 60079的本部分适用于额定输入电压不超过15 kV r.m.s.AC或DC的电气设备，包括Ex产品内部工作电压超过15 kV的电气设备，例如HID灯具起动器。

Preface:This is the third edition of CAN/CSA-C22.2 No. 60079-15,Explosive atmospheres — Part 15: Equipment protection by type of protection "n", which is an adoption, with Canadian deviations, of the identically titled IEC (International Electrotechnical Commission) Standard 60079-15 (fifth edition, 2017-12). It supersedes the previous edition published in 2016 as CAN/CSA-C22.2 No. 60079-15 (adopted IEC 60079-15:2010). It is one in a series of Standards issued by CSA Group under Part II of theCanadian Electrical Code.For brevity, this Standard will be referred to as "CAN/CSA-C22.2 No. 60079-15" throughout.This Standard is intended to be used in conjunction with CAN/CSA-C22.2 No. 60079-0,Explosive atmospheres — Part 0: Equipment — General requirements.Changes to this edition include the changes to the fifth edition of the IEC Standard:a) Enclosed break devices "nC" are now designated as "dc" and the requirements are located in CAN/CSA-C22.2 No. 60079-1.b) Type of protection "nA" is now designated as type of protection "ec", and the requirements for "ec" equipment are located in CAN/CSA-C22.2 No. 60079-7.c) Test time for the preparation of non-incendive component samples has been specified.d) Additional documentation requirements for seals and gaskets have been added.e) As the pressure inside an enclosure fitted with fans can be affected by the operation of the fan, it is now specified that the restricted breathing test is conducted with fans operating and stationary.f) The limitations from CAN/CSA-C22.2 No. 60079-15, first edition, were added.This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.Scope:This part of IEC 60079 specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection "n" which includes; sealed devices "nC", hermetically sealed devices "nC", non-incendive components "nC" and restricted breathing enclosures "nR" intended for use in explosive gas atmospheres. This part of IEC 60079 applies to electrical equipment where the rated input voltage does not exceed 15 kV r.m.s. AC or DC including where the internal working voltages of the Ex product exceeds 15 kV, for example starters for HID luminaires.